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GraphQL is a query language specification that is used for Web APIs to permit the use of API clients to create data queries. The queries can be specific to the client, and they are sent to a GraphQL server that is able to return exactly the data that was requested. A single GraphQL POST request can be used to obtain all of the data that is needed for the current context. This is in contrast to RESTful APIs, that might result in a chain or waterfall of requests, with each request requiring data from the previous, in order to retrieve all of the data from the API server.
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At this point we have the "index.html" and the "script.js" file setup so we can make sure that it is working by testing it locally. To do this we will need to install the http-server npm package. Before proceeding make sure to have Node.js and npm installed as they are required.
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SurveyJS
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Typically a GraphQL client is used to facilitate the client side query building, and to send HTTP POST requests containing GraphQL queries to the GraphQL server responsible for returning the data. It is not required to use a dedicated GraphQL client, as it is possible to send a GraphQL query as a POST request using the Fetch API, and this is similar to the process used to submit FormData using the Fetch API. To show how to send a POST request containing a GraphQL query with the Fetch API, data from the GraphQL API: https://content.wpgraphql.com/graphql provided by WPGraphQL can be used. After fetching the latest posts from the GraphQL API, by sending a POST request containing the GraphQL query, we can display the data as a list with each item title as a link.